Process for the preparation of a concentrated animal-dip.



RQBEBT M. CHAPIN, OF WASHINGTON, DISTRICT OF COLUMBIA.

PB-DCESS'FOR THE PREPARATION OF A CONUENTRATED ANIMAL-DIP.

innea-e. No Dreiving.

Specification of Letters Patent.

Patented May at, 19315.

Application filed May 28, late. Serial No. 841,558.

(DEDICATED TO THE PUBLIC.)

T all whom it may concern:

5e it known that 1, ROBERT M. CHAPIN, a citizen of the United States,and an eraployee of the Department of Agriculture of the said UnitedStates, residing in the city of li'ashington', District of Columbia,whose post-0fil address is Washington, District of Columbia, haveinvented a new and useful Process for the Preparation of a ConcentratedAnimal-Dip. i

This application is made under the act of March 3, 1883, chapter 143 (22Stat, 625), and the invention herein described and claimed may be usedby the Government of the United States or any of its oliicers oremployees in the prosecution of work for the United States or by anyperson in the United States without the payment of any royalty thereon.

The object of my invention isto provide a new and improved process forthe preparation of a Concentrated animal dip composed essentially ofalkali arsenite and alkali can bcnate, together with pine-tar and othervaluable ingredients, the product being miscible with water to form auniform insecticide, appropriate and desirable for the dipping orspraying of cattle or other animals, with a view of ridding them ofTexas fever ticks. or other deleterious parasitic insects. Solutionscontaining alkali arsenite, alkali carbonate, pine tar and similarmaterials form an effective and useful bath for destroying Texas-feverticks and other insci-ts which infest cattle and other animals. Suchsolutions are usually prepared by boilinf! together powdered whitearsenic and sodium carbonate with water until solution has beenei'i'ected, cooling the resultin solution to a certain temperature (140F. ,then pouring into the solution pinetar in a thin stream and thenstirring the composition until the pine-tar has become emulsified andfliniioi'ml disseminated throughout the solu tion. Making the solutionby this process involves considerable time and personal superx ision,and requires a capacious kettle or vat for the boiling and a furnace orother suitable heater for furnishing the necessary heat. Moreover, theresulting dip cannot be prepared in highly concentrated form, first,because of frothin and foaming caused by the, rapid escape oi carbondioxid from the boiling mixture, and secondly, because the tar will notemulsify properly except'when added to the considerably diluted solutionat a de-' gree of temperature approximating 140 F. l n experiments whichI have made, I have discovered that these diiiiculties .or drawbacks maybe readily and conveniently overcome by the substitution of causticalkali for a portion of the carbonated alkali previously My inventionconsists in the proper proportioning and method of blendm of powderedwhite arsenic, caustic alkali, carbonated alkali, pine-tar and Water,without the use of externally applied heat, so that a highlyconcentrated product shall result which, upondilution with cold Water insuitable proportion, will form a. uniform liquid suitable for destroyingTexas-fever ticks and other insects that infest animals. In practisingmy process I employ for solution of the arsenic, an amount of causticalkali, which is not more than sufficient to chemically combine with thequantity of white arsenic used, to form an alkali metarsenite whereinalkali and arsenic are contained in combination in the proportion of 1atom of alkali metal to 1 atom of arsenic, the resulting solution thuscontaining no free caustic alkali. On the other hand, I use not lessthan 85 per cent. of said theoretical amount of caustic alkali in orderto obtain uniformly satisfactory results. I therefore weigh 4 lbs. ofcaustic soda of purity of not lessthan 8.5% actual NaOH into a 5 gallonmetal pail into which I pour 1 gallon of cold Water. I stir thecomposition continuously until the caustic soda is practically alldissolved, when I add 10 lbs.

of finely powdered White arsenic as rapidly as it can be blended in byconstant stirring, though not so rapidly that the heat produced bychemical reaction shall cause the mixture to actually boil. lVhen thearsenic has been entirely added and completely dissolved, 1 immediateladd 1 to 1?; gallons more Water and 10 l s. crystallized sodiumcarbonate (Na QO .10H,-,O), and continue the stirring operation untilsolution is complete, I then allow the mixture to become cold andfinally dilute it with Water to total volume of 5 gallons. 1 designatethis solution arsenic stock. 1 also prepare -a tar stock, in thefollowing manner: I dissolve one-half pound caustic soda in 1 quartwater, add thereto 1 gallon pine-tar and stir until the mixture becomesuniform. I then test the mixture by rubbing up about a teaspoouful in aglass oi'water. If it does not show itself entirely miscible to auniform emulsion, I blend in successive smaller quantities of atsolution of one-half pound caustic soda in a quart oi Water until thedesired result is attained. For use in dipping or spraying, I firstdilute 1 gallon of the ar-- sonic stock with about gallons Water. 1

then mix 1 to l quarts of tar stock with 2 or 3 gallons of Water and addthe mixture to the already diluted arsenic stock. I finally inalre thetotal volume of liquid or gallons according to the strength desired, andstir the composition thoroughly before applying the solution to animals.

In preparing the product, caustic potash may be substituted inchemically equivalent amount for caustic soda" Having thus described myinvention I claim:

1. The process for preparing a c0neeutrated animal dip from arseniousoXid, con

sisting in preparing a strong Water solution of caustic alkali, thenadding thereto finely powdered arsenious 02nd, and simultaneouslystari-tially as specified.

menses blending the mixture by stirring, and main tending the saidmixture at a temperature approximately the boiling point Without theapplication of external heat by stirring the composition simultaneouslywith the addition of the arsenious oXid, dissolving in the resultantsolution sodium carbonate, then permitting the dilution of the saidsolution, and adding thereto pine-tar rendered miscihle with. Water" byprevious blending, sub- 2. The process for preparing a concentratedarsenical animal dip consisting dissolving l pounds of caustic soda inone gallon of Water, dissolving in said solution 10 pounds of arse u'ousoxid by aid of heat generated by chemical. reaction, then adding to litsaid composition 10 ounds of crystallized sodium carbonate 1. J.suliicieut Water to make the cooled solution amount to a total volume of5. gallons,"permittingthe dilution of said solution to an appropriatedegree and then adding thereto e blended mixture of approximately poundot'eeustie soda,, one quart of Water, and one gallon. of pinetarsubstantially as specified.

in testimony whereof I ailix my signature in the presence RUEBERT M..QHAPEN'.

l vitnesses Homes H, Cosme, JAMES N. Terms,

of two subscribed Witnesses.

